New weather overlays

AvPlan 2.0 includes a completely revamped weather overlay system. The BOM radar can be overlaid all map types (not just the WAC charts as in the current version) and we have added current lightning information as well.

The weather animation can be controlled too. It can be paused, played, and stepped forward and backward. It displays the current download state, plus the time of the image, and the time of that image relative to the current time.